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Home >> BMW >> 2009 >> M3 2D Convertible, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 973 (Seats - Repair - E90) >> Front Seat, Normal, Electronic >> 52 14 886 Replacing gas cartridge (firing unit) for crash-active head restraint on front seat

52 14 886 Replacing gas cartridge (firing unit) for crash-active head restraint on front seat

WARNING: This page is about a different car, the 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Read and comply with safety regulations  for handling airbag modules and pyrotechnical belt pretensioners.
Incorrect handling may result in triggering of the crash-active head restraint and thereby cause injury. See 72 00... SAFETY REGULATIONS FOR HANDLING COMPONENTS WITH GAS GENERATORS .

Switch off ignition!

Necessary preliminary tasks: 

IMPORTANT: The firing unit may be replaced up to 4 times.
Triggering frequency is denoted on the sticker on the head restraint carrier.
Stickers are available as spare parts.

Starting situation: 

Head restraint is in the crash position after being triggered.

NOTE: Firing unit can only be removed in the triggered state.
The complete crash-active head restraint must be replaced if the event of a head restraint fault signal and an untriggered firer.

Lever out cover welt in marked area.

Remove cover with padding from head restraint.

Fig 1: Identifying Seat Cover Marking Area
G06202956Courtesy of BMW OF NORTH AMERICA, INC.

Unclip service flap.

Move firing unit (1) forwards and remove towards front.

Fig 2: Moving Firing Unit
G06202957Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten plug connection (1) and disconnect.

Replace firing unit.

Installation: 

Plug connection (1) must audibly snap into place.

Check firm engagement of plug connection (1) by gently pulling on plug.

Lay cable in side guide.

Fig 3: Identifying Plug Connection
G06202958Courtesy of BMW OF NORTH AMERICA, INC.

Press locking spring (1) on left and right through opening and secure with dowel pins (or similar).

Head restraint is unlocked.

Fig 4: Pressing Locking Spring
G06202959Courtesy of BMW OF NORTH AMERICA, INC.
IMPORTANT: This work requires a great exertion of effort!

Pull head restraint (1) at an angle downwards until it is completely in lowest position and rests on linkage.

Hold head restraint (1) in this position for the following tasks.

Fig 5: Pulling Head Restraint
G06202960Courtesy of BMW OF NORTH AMERICA, INC.

Clip firing unit (1) onto linkage (2).

Installation: 

Check that firing unit (1) is firmly seated on linkage.

Press firing unit (1) forwards and clip into place.

IMPORTANT: Firing unit (1) must audibly snap into place.
Fig 6: Pressing Firing Unit
G06202961Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Visually check that firing unit is correctly seated.

Attach sticker for identification after replacement.

Clip service flap into place.

Fig 7: Identifying Mark Area
G06202962Courtesy of BMW OF NORTH AMERICA, INC.
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